Thanks for the comments lads.
Back on the paddock tonight, booked in with the old bill for half eight, mounted the lamp up and away i went, without a coat!! (well it was warm!!)
Using the red filter the rabbits just sat, making for easy pickings. The odd couple hot footed away but the rest just sat and waited their turn. The going was good for the first 10 mins, then on cue a flash of lightning and the heavens opened and it absolutely tipped it down. Managed another couple until visibility became nil through the scope, game over.
I hadnt wandered very far so most of the bag were lying with